Improvement in steam-generators



UNITED STATES PATENT ()rrron.

DAVID RENSHAW, OF SYRACUSE, NEW YORK.

' IMPROVEMENT m STEAM-GENERATORS.

To all whom it may concern:

Be it known that I, DAVID RENSHAW, of Syracuse, in the county ofOnondaga and State of New York, have invented certain Improvements inSteam-Generators, of which'the following is a specification:

' Nature and Object of the Invention.

This invention relates to the construction of the parts exposed to thedirect action of the heat in generating steam and their combination withother parts, and their arrangements with relation thereto; and isdesigned to fur nish a more compact steam-generator, and one in manyrespects more serviceable than any heretofore in use.

vDescription 0f the Accompanying Drawing.

' V Figure l is a front elevation of the steamgenerating apparatus andthe section of the reverberatory t'urnace with which these parts are tobe combined, and inside of which they are to be arranged. Fig. 2 is alongitudinal view in similar elevation andsection. Fig. 3

is a detail view, showing in horizontal section one of the modesin whichI propose to construct the fiat cast-metal sections which constitute theprincipal, or at least large, part of the steam-generating portion of myimproved generator. Fig. lis a similar section, showing another mode ofconstruction.

General Description.

- the construction of the boiler which is hereinafter described, andespecially to furnish a central support for the boiler. D is a centralcylinder extending the whole length of the furnace and connected at ornear its ends to the cylinders E E by the cross-cylinders F F. Thecentral cylinder D is provided with upwardly-projecting connections a ato receive the central vertical pipes G G, which latter connect with theconnections H H, which form communications between the pipes G G and thesteam-drum L. Said pipes G G also have Specification forming part ofLetters Patent No. 133,723, dated December 10,1872.

lateral projecting connections I) b, which connect with the flatsections J J, which latter also connect at the bottom with the sidecylinders E E. These flat sections J J are cast in a single piecetogether with the stay-bolts c c, which are east through holes in thecores on which these sections are cast. In Fig. 4 these stay-bolts c care represented as being cast hollow, their junction with the mainportion of the section rounded as there shown, to

prevent their crackin gfrom unequal expansion the parts designed for thegeneration of steam,

and hence a boiler of very great capacity may, when constructed as Ihave described, be contained in a very small space, while, at the sametime, as the sediment formed in these steamgenerating parts must alldescend into the cylinders D and E E, the boiler can be easily keptclean.

Claims.

I claim as my invention- 1. The combination, with thereverberatoryfurnace A, of the flat sections J J, made broadand theinside angles rounded, as shown, so

as to unite the said stay-bolts with the shell of the section upon acurve both inside and outside, instead of at an angle, substantially ashereinbefore set forth.

DAVID RENSHAW.

Witnesses THos. P. How, NNA. M. Nonrnecr.

d d d are gage-cocks. e

